Optical magnetism in planar metamaterial heterostructures

Georgia T. Papadakis (), Dagny Fleischman, Artur Davoyan, Pochi Yeh and Harry A. Atwater
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Georgia T. Papadakis: California Institute of Technology
Dagny Fleischman: California Institute of Technology
Artur Davoyan: California Institute of Technology
Pochi Yeh: University of Santa Barbara
Harry A. Atwater: California Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Harnessing artificial optical magnetism has previously required complex two- and three-dimensional structures, such as nanoparticle arrays and split-ring metamaterials. By contrast, planar structures, and in particular dielectric/metal multilayer metamaterials, have been generally considered non-magnetic. Although the hyperbolic and plasmonic properties of these systems have been extensively investigated, their assumed non-magnetic response limits their performance to transverse magnetic (TM) polarization. We propose and experimentally validate a mechanism for artificial magnetism in planar multilayer metamaterials. We also demonstrate that the magnetic properties of high-index dielectric/metal hyperbolic metamaterials can be anisotropic, leading to magnetic hyperbolic dispersion in certain frequency regimes. We show that such systems can support transverse electric polarized interface-bound waves, analogous to their TM counterparts, surface plasmon polaritons. Our results open a route for tailoring optical artificial magnetism in lithography-free layered systems and enable us to generalize the plasmonic and hyperbolic properties to encompass both linear polarizations.

Date: 2018
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DOI: 10.1038/s41467-017-02589-8

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